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Daytime length or daytime duration is the time elapsed between beginning and end of the daytime period. Given that Earth's own axis of rotation is tilted 23.44° to the line perpendicular to its orbital plane , called the ecliptic , the length of daytime varies with the seasons on the planet's surface, depending on the observer's latitude .
Temporal hours were common in many cultures. A division of day and night into twelve hours each was first recorded in Ancient Egypt.A similar division of day and night was later made in the Mediterranean basin from about Classical Greek Antiquity into twelve temporal hours each (Ancient Greek: ὥραι καιρικαί, romanized: horai kairikai).
An equinoctial hour is one of the 24 equal parts of the full day (which includes daytime and nighttime). Its length, unlike the temporal hour , does not vary with the season , but is constant. The measurement of the full day with equinoctial hours of equal length was first used about 2,400 years ago in Babylonia to make astronomical ...
A day is the time period of a full rotation of the Earth with respect to the Sun.On average, this is 24 hours (86,400 seconds).As a day passes at a given location it experiences morning, afternoon, evening, and night.
The tropics have little difference in the length of day and night. [6] At the 45th parallel, the longest winter night is roughly twice as long as the shortest summer night. [8] Within the polar circles, night will last the full 24 hours of the winter solstice. [5] The length of this polar night increases closer to the poles.
These effects make the day about 14 minutes longer than the night at the equator and longer still towards the poles. The real equality of day and night only happens in places far enough from the equator to have a seasonal difference in day length of at least 7 minutes, [30] actually occurring a few days towards the winter side of each equinox ...
The winter solstice marks the shortest day and longest night of the year, according to the National Weather Service. This occurs due to the Earth's tilt from the sun.
As with the Egyptian night and daytime hours, the division of the day into 12 shi has been credited to the example set by the rough number of lunar cycles in a solar year, [56] although the 12-year Jovian orbital cycle was more important to traditional Chinese [57] and Babylonian reckoning of the zodiac. [58] [f]